I used to climb abantos when I was a teenager with my brothers bike. Its quite easy, except two parts of it. The first one is in the streets of San Lorenzo de El Escorial village, made with stones, slippery and very steep. The second one is close to the end. In between, the climbing is easier and even it has a downhill; the road is bad and it has a lot of patchs. The views are great and the food is superb!!!